
.page-center {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.parent,
.son {
  border: 1px solid #ccc;
  border-radius: 4px;
  text-align: center;
}

.parent {
  width: 200px;
  height: 300px;
}


.son {
  width: 100px;
  height: 100px;
}
